If there are quality problems in plastic products, how to find the reason from the injection mold

If there are quality problems in plastic products, how to find the reason from the injection mold

①In the process of injection molding, if it is found that the geometric shape of the plastic product is unstable and the error of the external dimension is relatively large, it may be that the compression ratio of the inner cavity of the mold is relatively small; the length of the molding part of the mold die is relatively small; the sizing sleeve is deformed or the mold is The specific temperature is not uniform.

②If the surface of the product is yellowed and the phenomenon of focal spots often occurs, the expansion angle of the diverter cone in the mold may be relatively large, resulting in a large resistance to the melt flow; there may be a stagnation zone in the mold melt flow channel cavity, and the flow Unobstructed; there is a blocking foreign body in the flow channel cavity.

③ If the longitudinal grooves on the surface of the product are uninterrupted, there may be foreign objects stuck in a certain part of the runner cavity, and there may be scratches, burrs or severe wear and rough surfaces in the shaping part.